1) heavy material (e.g. rock, iron, sand, water) put into a ship to keep it steady or used to make a road or a railway (ballast)

2) that cannot be put into practice or used (impracticable)

3) that cannot be put into words (inexpressible)

4) something (a substance, idea, piece of information etc) provided during a process; information (to be) put into a computer (input)

5) (of ideas, suggestions) that can be done or used or put into practice (practicable)

6) a coded collection of instructions (to be) put into a computer (program)

7) (of an engine, machine) repaired and put into a good condition again (reconditioned)

8) a form of medicine in a container (to be) put into the rectum or vagina (suppository)

9) understood without being put into words (tacit)